CN111154052B - Viscosity reducer for ultra-high performance concrete and preparation method and application thereof - Google Patents

Viscosity reducer for ultra-high performance concrete and preparation method and application thereof Download PDF

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CN111154052B
CN111154052B CN202010023154.8A CN202010023154A CN111154052B CN 111154052 B CN111154052 B CN 111154052B CN 202010023154 A CN202010023154 A CN 202010023154A CN 111154052 B CN111154052 B CN 111154052B
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polyethylene glycol
viscosity reducer
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CN111154052A (en
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王敏
姚灏
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Hunan University
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F292/00Macromolecular compounds obtained by polymerising monomers on to inorganic materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2605Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641Polyacrylates; Polymethacrylates
    • C04B24/2647Polyacrylates; Polymethacrylates containing polyether side chains
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B24/00Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24Macromolecular compounds
    • C04B24/26Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2664Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
    • C04B24/267Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers containing polyether side chains
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F283/00Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
    • C08F283/06Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
    • C08F283/065Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/40Surface-active agents, dispersants
    • C04B2103/408Dispersants

Abstract

The invention discloses a viscosity reducer for ultra-high performance concrete, which comprises a siliceous volcanic ash material and a comb-shaped structure PCE polymer grafted on the surface of the siliceous volcanic ash material. The invention also provides a preparation method of the viscosity reducer, wherein a precursor is prepared by hydrolysis reaction of the monomer A and a siliceous volcanic ash material, and the viscosity reducer is prepared by addition polymerization reaction of the precursor, the monomer B and the monomer C.

Description

Viscosity reducer for ultra-high performance concrete and preparation method and application thereof
Technical Field
The invention relates to the field of concrete admixtures, in particular to a viscosity reducer for ultra-high performance concrete and a preparation method and application thereof.
Background
The compressive strength of the ultra-high performance concrete (UHPC) is higher than 120MPa, and the ultra-high performance concrete has good toughness and excellent durability and is a key point and a hot spot of the current domestic and foreign research. To achieve ultra-high strength, UHPC systems typically have a water-to-cement ratio of less than 0.25 and require the introduction of nano-or micro-sized mineral admixtures to fill the voids between the cement particles. Mineral admixtures generally act as a filler effect, pozzolanic effect, roll ball effect and hydration nucleation effect in UHPC systems. Because the mineral admixture has low density, small particle size, large specific surface area, high surface activity, strong adsorption among particles, difficult dispersion and agglomeration phenomena with different degrees in cement-based material slurry and mortar, the dispersion condition of the mineral admixture greatly influences the working performance of the UHPC.
The admixture is used as a key component of concrete and plays a decisive role in various performances of the concrete. The viscosity reducer is widely used at present and is of a polycarboxylic acid (PCE) type, the traditional PCE of the PCE is of a comb-shaped structure, a main chain is connected by a C-C bond, and a main molecular chain is provided with carboxyl, sulfonic acid and other adsorption groups which can be adsorbed on the surface of cement particles to form a polymer adsorption layer with a certain thickness; hydrophilic long side chains may then provide steric hindrance.
The usage amount of PCE in UHPC is 15 times of that of common concrete. Although a large amount of PCE is added, the ultra-high performance concrete contains a large amount of siliceous volcanic ash materials, still has the defect of high viscosity, causes a series of construction problems of poor workability such as concrete stirring, transportation, pumping and the like, and limits the popularization and application of high-strength and ultra-high strength concrete to a great extent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a viscosity reducer for ultra-high performance concrete, which effectively reduces the viscosity of the ultra-high performance concrete, has high water reducing rate and low cost, and correspondingly, the invention also provides a preparation method and application of the viscosity reducer for ultra-high performance concrete.
In order to solve the technical problems, the invention adopts the following technical scheme:
the viscosity reducer for the ultra-high performance concrete comprises a siliceous volcanic ash material and a comb-shaped structure PCE polymer grafted on the surface of the siliceous volcanic ash material.
As a further improvement to the above technical solution:
the siliceous volcanic ash material is one or more of silica fume, fly ash, slag powder and metakaolin, and the average particle size is not more than 100 mu m; the molecular weight range of the comb-structure PCE polymer is 5000-500000.
As a general inventive concept, the invention also provides a preparation method of the viscosity reducer for the ultra-high performance concrete, which comprises the following steps:
s1, uniformly dispersing the siliceous volcanic ash material in water, and adding the monomer A under the stirring condition for hydrolysis reaction to obtain a precursor;
s2, mixing the precursor with the aqueous solution of the monomer C, adding an oxidant, uniformly stirring, simultaneously adding the aqueous solution of the monomer B, a reducing agent and an aqueous solution of a chain transfer agent to perform an addition polymerization reaction, grafting a comb-shaped structure PCE polymer on the surface of the siliceous volcanic ash material, adding a pH regulator to adjust the pH value to 6-7 after the reaction is finished, and obtaining the viscosity reducer for the ultra-high performance concrete;
the molecular structure general formula of the monomer A is as follows:
Figure BDA0002361526450000021
in the formula, R1Is composed of
Figure BDA0002361526450000022
R2 is-OH, -O-CH3、-CH3、-O-CH2-CH3and-CH2-CH3N is 0 to 50;
the monomer B is one or more of unsaturated acid, unsaturated anhydride, unsaturated amide and derivatives thereof for providing adsorbable groups;
the monomer C is one or more of unsaturated polyoxyethylene ester or unsaturated polyoxyethylene ether.
As a further improvement to the above technical solution:
the adsorbable group is an acid group.
The monomer B is one or more of methacrylic acid, acrylic acid, sodium acrylate, maleic acid, maleic anhydride, fumaric acid, citric acid, itaconic acid, sodium methyl acrylate, sodium allylsulfonate, 2-acrylamido-2-methyl-1-propanesulfonic acid, methacrylic sulfonic acid, sodium methallyl sulfonate, 2-acrylamido-2-methylpropane sulfonic acid, 2-acrylamido-2-tert-butyl sulfonic acid, sodium p-styrene sulfonate allyl alcohol and acrylamide.
The monomer C is methacrylic acid-based polyethylene glycol, allyl polyethylene glycol, isopentenyl polyethylene glycol, -alkoxylated isoprenol, alpha-allyl-omega-methoxy polyethylene glycol, polyethylene glycol acrylate, polyethylene glycol methacrylate, methoxy polyethylene glycol methacrylate, hydroxy or methoxy-terminated polyethylene oxide methacrylate, polyethylene glycol monomethyl ether monomethacrylate, methoxy polyethylene glycol acrylate, methoxy polyethylene glycol itaconic acid monoester, polyethylene glycol maleic acid half ester, allyl polyoxyethylene ether sulfate, butenyl alkylene polyoxyethylene-polyoxypropylene ether, alpha-allyl-omega-methoxy polyethylene glycol ether with different lengths of ethylene oxide units in alpha-side chains, methyl allyl polyethylene ether, isopentenyl polyoxyethylene ether, methyl allyl ether, methyl vinyl ether, methyl, Alkoxylated hydroxybutyl vinyl ether.
The reducing agent is one or more of ammonium persulfate, ascorbic acid, sodium bisulfite and sodium formaldehyde sulfoxylate.
The oxidant is one or more of tert-butyl hydroperoxide, benzoyl peroxide, sodium lauroyl peroxide, ammonium persulfate, sodium persulfate, potassium persulfate, sodium hydrogen persulfate, hydrogen peroxide, azodicyan valeric acid, 2-carbamyl azoisobutyronitrile and azodiisobutyronitrile.
The chain transfer agent is one or more of beta-mercaptopropionic acid, 3-mercaptoacetic acid, 2-mercaptoethanol, 2-mercaptopropionic acid, 3-mercaptopropionic acid, octyl thioglycolate, octyl 3-mercaptopropionate, n-mercaptoethanesulfonic acid, n-butylmercaptan, cyanoisopropyldithiobenzoate, thioglycerol, n-dodecylmercaptan, octylmercaptan and butyl thioglycolate, carbon tetrachloride, dichloromethane, bromoform, secondary alcohols such as isopropanol, sodium hypophosphite, potassium hypophosphite, bisulfite, sulfurous acid, dithionous acid, potassium dithionous acid, pyrosulfurous acid, potassium metabisulfite, sodium sulfite, potassium sulfite, sodium dithionous acid, sodium metabisulfite, sodium methallylsulfonate, methylsulfonylsulfonic acid and sodium methallylsulfonate.
In the step S1, the monomer A is added in a dropwise manner, the dropwise addition time is 1-3 h, and the hydrolysis reaction time is 1-3 h after the dropwise addition is completed.
In the step S2, the aqueous solution of the monomer B, the reducing agent and the aqueous solution of the chain transfer agent are added dropwise for 1-3 hours, and the time of the addition polymerization reaction after the dropwise addition is completed is 1-3 hours.
The mass ratio of the siliceous volcanic ash material to the monomer A to the monomer B to the monomer C is 1-6: 1-10: 25-35: 2-8.
Preferably, in the step S1, the siliceous pozzolan material is ultrasonically dispersed in water, and the time of ultrasonic dispersion is 10 to 25 min.
As a general inventive concept, the invention also provides an application of the viscosity reducer for the ultra-high performance concrete or the viscosity reducer for the ultra-high performance concrete prepared by the preparation method in the ultra-high strength concrete cementing material.
The viscosity reducer accounts for 1.0-5.0% of the total mass of the cementing material, and the total mass of the cementing material does not include siliceous volcanic ash materials in the viscosity reducer.
The technical principle of the invention is as follows:
the applicant finds that the dispersion degree of the mineral admixture and cement particles is closely related to the viscosity of UHPC, the dispersion degree of the mineral admixture is mainly determined by the interaction force and the steric hindrance effect between the particles, the electrostatic repulsion and the steric hindrance effect between the particles of the mineral admixture are improved, and the dispersion degree of the mineral admixture can be effectively improved. For cement particles, the larger the electrostatic repulsion and steric hindrance effect provided by the water reducing agent, the better the dispersibility of the particles. Based on the method, the monomer A and the siliceous volcanic ash material are subjected to hydrolysis reaction to prepare a precursor, and the precursor, the monomer B and the monomer C are subjected to addition polymerization reaction to prepare the inorganic-organic coupled amphoteric viscosity reducer (additive).
Compared with the prior art, the invention has the advantages that:
(1) according to the invention, on the basis of improving electrostatic repulsion and steric hindrance effect between a siliceous volcanic ash material and cement particles, the siliceous volcanic ash material is modified through hydrolysis reaction of the siliceous volcanic ash material and a monomer A (unsaturated siloxane and derivatives thereof) to prepare a precursor, the dispersibility of the siliceous volcanic ash material is improved, comb-shaped PCE is grafted on the surface of the siliceous volcanic ash material through addition polymerization reaction to prepare the viscosity reducer, the comb-shaped PCE on the surface of the viscosity reducer is adsorbed on the surface of the cement particles, the mutual repulsion force between the cement particles can be increased, and in addition, the steric hindrance effect of the viscosity reducer is provided by a mineral admixture and the PCE on the surface of the mineral admixture, so that the viscosity of UHPC can be greatly reduced. According to the invention, the siliceous volcanic ash material is effectively dispersed, and the novel viscosity reducer is synthesized by the siliceous volcanic ash material and the comb-shaped PCE through chemical reaction, so that the nanometer size effect and the structural advantages of the comb-shaped PCE are fully exerted.
(2) The preparation method of the viscosity reducer for the ultra-high performance concrete has the advantages of simple synthesis method, strong operability, low production cost and little environmental pollution.
(3) According to the application of the viscosity reducer for the ultra-high performance concrete, the viscosity reducer can effectively disperse siliceous volcanic ash materials in the ultra-high performance concrete, and fully exerts the electrostatic repulsion and the steric hindrance effect of the siliceous volcanic ash materials and the comb-shaped polycarboxylic acid water reducer (PCE), when the viscosity reducer is added into the ultra-high performance concrete according to the mass of 1.0-5.0% of the cementing materials, the viscosity of the ultra-high performance concrete can be reduced by 20-40%, the problems of large viscosity and difficult pumping construction of the ultra-high performance concrete are remarkably improved, the mechanical property and durability of the ultra-high performance concrete can be improved, and the viscosity reducer has the advantages of good viscosity reduction, low mixing amount, good cement adaptability and the like.
Detailed Description
The present invention will be described in further detail with reference to specific examples. Unless otherwise specified, the instruments or materials employed in the present invention are commercially available.
Example 1:
the preparation method of the viscosity reducer for the ultra-high performance concrete comprises the following steps:
the method comprises the following steps: adding 10g of silica fume (with the average particle size of 0.5 mu m) into 100g of water, ultrasonically dispersing for 15min (in other embodiments, the same or similar technical effect can be obtained within 10-25 min), transferring to magnetic stirring, dropwise adding 5g of Vinyl Triethoxysilane (VTEO), dripping for 1h, and continuing to react for 2h to obtain a precursor solution.
Step two: adding 137g of prenyl alcohol polyoxyethylene ether fully dissolved in water into the precursor solution, pouring 1.8g of hydrogen peroxide, stirring for 1-2min, gradually and dropwise adding a solution of 15.2g of acrylic acid and 30g of water, a solution of 0.3g of ascorbic acid, 0.76g of mercaptothiol and 50g of water at the same time, finishing dropping for 2.5h, reacting for 2h after finishing dropping, and neutralizing with sodium hydroxide until the pH value is 7 to obtain the viscosity reducer for the ultrahigh-performance concrete.
Example 2:
the preparation method of the viscosity reducer for the ultra-high performance concrete comprises the following steps:
the method comprises the following steps: adding 15g of fly ash (with the average particle size of 5.6 microns) into 120g of water, performing ultrasonic dispersion for 25min, transferring to magnetic stirring, dropwise adding 5g of gamma-methacryloxypropyltrimethoxysilane (KH570) for 1h, and continuing to react for 1h to obtain a precursor solution.
Step two: adding 140g of allyl alcohol polyoxyethylene ether fully dissolved in water into the precursor solution, pouring 1.8g of hydrogen peroxide, stirring for 1-2min, gradually and simultaneously dropwise adding a solution of 20g of methyl methacrylate and 50g of water, a solution of 0.5g of ascorbic acid, 0.9g of thioglycolic acid and 50g of water, finishing dropping for 2h, reacting for 1.5h after finishing dropping, and neutralizing with sodium hydroxide until the pH value is 7 to obtain the viscosity reducer for the ultrahigh-performance concrete.
Example 3:
the preparation method of the viscosity reducer for the ultra-high performance concrete comprises the following steps:
the method comprises the following steps: adding 20g of silica fume (average particle size of 0.5 mu m) into 150g of water, ultrasonically dispersing for 20min, transferring to magnetic stirring, dropwise adding a mixture of 5g of gamma-methacryloxypropyltrimethoxysilane (KH570) and 5g of Vinyl Triethoxysilane (VTEO), dripping for 2h, and continuing to react for 1h to obtain a precursor solution.
Step two: adding 170g of allyl alcohol polyoxyethylene ether fully dissolved in water into the precursor solution, pouring 1.8g of hydrogen peroxide, stirring for 1-2min, gradually and simultaneously dropwise adding a solution of 30g of maleic anhydride and 70g of water, a solution of 0.5g of ascorbic acid, 0.7g of mercaptopropionic acid and 50g of water, completing dripping for 2.5h, reacting for 1h after finishing dripping, and neutralizing with sodium hydroxide until the pH is 7 to obtain the viscosity reducer for the ultrahigh-performance concrete.
Comparative example:
the preparation method of the viscosity reducer comprises the following steps: and (2) pouring 1.8g of hydrogen peroxide into 137g of isopentenol polyoxyethylene ether fully dissolved in water, stirring for 1-2min, gradually dropwise adding a solution of 15.2g of acrylic acid and 30g of water, a solution of 0.3g of ascorbic acid, 0.76g of mercaptothiol and 50g of water at the same time, finishing dropping for 2.5h, reacting for 2h after finishing dropping, and neutralizing with sodium hydroxide until the pH value is 7 to obtain the viscosity reducer.
The viscosity reducer for ultra-high performance concrete prepared in examples 1, 2 and 3 and the viscosity reducer prepared in comparative example are respectively added into a cementing material (in the example, the viscosity reducer is 1.0% of the total mass of the cementing material, and the mass of siliceous pozzolan material contained in a precursor part needs to be removed), and the cementing material is added into ultra-high performance concrete, wherein the ultra-high performance concrete adopted in the invention is P.I 42.5 standard cement, the water-cement ratio is 0.18, and the silica fume mixing amount is 20%.
In other embodiments, the viscosity reducer for ultra-high performance concrete of the present invention can be used in combination with at least one of other additives known in the art, including water reducers, early strength agents, air entraining agents, defoamers, shrinkage reducers, swelling agents, and the like.
The net paste fluidity is measured according to the determination method of the net paste fluidity of the admixture cement in GB8076-2008 'concrete admixture Specification', and the net paste viscosity is obtained through the test result of a rheometer. The rheological parameters and thixotropy of the slurry were tested using a RheoPlus QC type coaxial cylindrical rheometer from Anton Paar, Germany. The rotor is a coaxial cylindrical rotor with the diameter of 40mm, the diameter of a sample cylinder of the rheometer is 41.94mm, the height of the sample cylinder is 118mm, and the volume of the sample cylinder is 163 mL. In order to reduce the sliding, the surfaces of the sample cylinder and the rotor which are in contact with the slurry are subjected to sand blasting. The sample cylinder is sleeved in a constant temperature outer cylinder connected with a temperature control device, and the temperature is set to be 25 ℃.
TABLE 1 comparison table for testing basic performance of ultra-high performance concrete using viscosity reducer
Figure BDA0002361526450000051
Figure BDA0002361526450000061
As can be seen from Table 1, the viscosity reducer for ultra-high performance concrete prepared in examples 1, 2 and 3 of the present invention is effective in reducing the viscosity of cement, compared to the viscosity reducer prepared in the comparative example.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (9)

1. The viscosity reducer for the ultra-high performance concrete is characterized by comprising the following components in parts by weight: the viscosity reducer comprises a siliceous volcanic ash material and a comb-shaped structure PCE polymer grafted on the surface of the siliceous volcanic ash material;
the siliceous volcanic ash material is one or more of silica fume, fly ash, slag powder and metakaolin, and the average particle size is not more than 100 mu m; the molecular weight range of the comb-structure PCE polymer is 5000-500000.
2. A preparation method of the viscosity reducer for the ultra-high performance concrete is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, uniformly dispersing the siliceous volcanic ash material in water, and adding the monomer A under the stirring condition for hydrolysis reaction to obtain a precursor;
s2, mixing the precursor with the aqueous solution of the monomer C, adding an oxidant, uniformly stirring, simultaneously adding the aqueous solution of the monomer B, a reducing agent and an aqueous solution of a chain transfer agent to perform an addition polymerization reaction, grafting a comb-shaped structure PCE polymer on the surface of the siliceous volcanic ash material, adding a pH regulator to adjust the pH value to 6-7 after the reaction is finished, and obtaining the viscosity reducer for the ultra-high performance concrete;
the molecular structure general formula of the monomer A is as follows:
Figure FDA0002795815030000011
in the formula, R1Is composed of
Figure FDA0002795815030000012
One of (1), R2is-OH, -O-CH3、-CH3、-O-CH2-CH3and-CH2-CH3N is 0 to 50;
the monomer B is one or more of unsaturated acid, unsaturated anhydride, unsaturated amide and derivatives thereof for providing adsorbable groups;
the monomer C is one or more of unsaturated polyoxyethylene ester or unsaturated polyoxyethylene ether.
3. The method of claim 2, wherein:
the monomer B is one or more of methacrylic acid, acrylic acid, sodium acrylate, maleic acid, maleic anhydride, fumaric acid, citric acid, itaconic acid, sodium methyl acrylate, sodium allylsulfonate, 2-acrylamido-2-methyl-1-propanesulfonic acid, methacrylic sulfonic acid, sodium methallyl sulfonate, 2-acrylamido-2-methylpropane sulfonic acid, 2-acrylamido-2-tert-butyl sulfonic acid, sodium p-styrene sulfonate allyl alcohol and acrylamide.
4. The production method according to claim 3, characterized in that:
the monomer C is methacrylic acid-based polyethylene glycol, allyl polyethylene glycol, isopentenyl polyethylene glycol, -alkoxylated isoprenol, alpha-allyl-omega-methoxy polyethylene glycol, polyethylene glycol acrylate, polyethylene glycol methacrylate, methoxy polyethylene glycol methacrylate, hydroxy or methoxy-terminated polyethylene oxide methacrylate, polyethylene glycol monomethyl ether monomethacrylate, methoxy polyethylene glycol acrylate, methoxy polyethylene glycol itaconic acid monoester, polyethylene glycol maleic acid half ester, allyl polyoxyethylene ether sulfate, butenyl alkylene polyoxyethylene-polyoxypropylene ether, alpha-allyl-omega-methoxy polyethylene glycol ether with different lengths of ethylene oxide units in alpha-side chains, methyl allyl polyethylene ether, isopentenyl polyoxyethylene ether, methyl allyl ether, methyl vinyl ether, methyl, Alkoxylated hydroxybutyl vinyl ether.
5. The method of claim 4, wherein:
the reducing agent is one or more of ammonium persulfate, ascorbic acid, sodium bisulfite and sodium formaldehyde sulfoxylate;
the oxidant is one or more of tert-butyl hydroperoxide, benzoyl peroxide, sodium lauroyl peroxide, ammonium persulfate, sodium persulfate, potassium persulfate, sodium hydrogen persulfate, hydrogen peroxide, azodicyan valeric acid, 2-carbamoyl azoisobutyronitrile and azodiisobutyronitrile;
the chain transfer agent is one or more of beta-mercaptopropionic acid, 3-mercaptoacetic acid, 2-mercaptoethanol, 2-mercaptopropionic acid, 3-mercaptopropionic acid, octyl thioglycolate, octyl 3-mercaptopropionate, n-mercaptoethanesulfonic acid, n-butylmercaptan, cyanoisopropyldithiobenzoate, thioglycerol, n-dodecylmercaptan, octylmercaptan and butyl thioglycolate, carbon tetrachloride, dichloromethane, bromoform, secondary alcohols such as isopropanol, sodium hypophosphite, potassium hypophosphite, bisulfite, sulfurous acid, dithionous acid, potassium dithionous acid, pyrosulfurous acid, potassium metabisulfite, sodium sulfite, potassium sulfite, sodium dithionous acid, sodium metabisulfite, sodium methallylsulfonate, methylsulfonylsulfonic acid and sodium methallylsulfonate.
6. The production method according to any one of claims 2 to 4, characterized in that:
in the step S1, the monomer A is added in a dropwise manner, the dropwise addition time is 1-3 h, and the hydrolysis reaction time is 1-3 h after the dropwise addition is completed;
in the step S2, the aqueous solution of the monomer B, the reducing agent and the aqueous solution of the chain transfer agent are added dropwise for 1-3 hours, and the time of the addition polymerization reaction after the dropwise addition is completed is 1-3 hours.
7. The production method according to any one of claims 2 to 4, characterized in that: the mass ratio of the siliceous volcanic ash material to the monomer A to the monomer B to the monomer C is 1-6: 1-10: 25-35: 2-8.
8. Use of the viscosity reducer for ultra-high performance concrete according to claim 1 or the viscosity reducer for ultra-high performance concrete prepared by the preparation method according to any one of claims 2 to 7 in an ultra-high strength concrete cement.
9. Use according to claim 8, characterized in that: the viscosity reducer accounts for 1.0-5.0% of the total mass of the cementing material, and the total mass of the cementing material does not include siliceous volcanic ash materials in the viscosity reducer.
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